S-91273A937 1/4"-28 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, heavy-duty fastening.
- Precise alignment and smooth rotation provided by the 1-1/4" shoulder with standard fit, reducing wear on mating components.
- Secure, non-slip installation enabled by the knurled head texture and 1/8" hex drive, ensuring firm tool grip.
- Fine thread accuracy with 1/4"-28 UNF Class 2A threads for tight, vibration-resistant connections in precision assemblies.
- Consistent durability backed by Rockwell B55 hardness, maintaining performance under repeated stress.
- Compliance with global standards including RoHS 3 and REACH, ensuring safe, sustainable use in regulated industries.
Professional Applications & Engineering Value
This shoulder screw is engineered to address common industrial challenges such as component misalignment and premature wear in rotating assemblies. The 18-8 stainless steel material, combined with a black oxide finish, provides excellent resistance to corrosion and oxidation, extending service life in demanding settings like machinery, automotive, and electronic enclosures. The 1/4"-28 UNF fine thread and precise Class 2A fit ensure secure fastening with minimal risk of loosening under vibration, while the knurled head enhances grip during installation. Ideal for applications requiring a dependable pivot or spacer, this screw supports smooth operation and reduces maintenance needs in industrial assembly systems.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 2A tolerance for precise fit, a shoulder diameter of 1/4" with tolerance from -0.004" to -0.002", and a shoulder length of 1-1/4" with tolerance from -0.005" to 0.005". Manufactured to standard specifications, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.
